Hypodermic syringe.



H. S. COOK.

HY PODERMIC SYRINGE.

APPLICATION FILED OCT. 21, I916- Patented June 26, 1917.

INVENTOR .Harwy ,5. 600% ATTORNEY HARVEY S. COOK, 0F WORTHINGTON,INDIANA.

HYPODERMIC SYRINGE.

Specification of Letters Patent.

Patented June 26, 1917.

Application filed October 21, 1916. Serial No. 126,984.

To all whom it may concern:

Be it known that I, HARVEY S. COOK, a citizen of the United States,residing at Worthington, in the county of Greene and State of Indiana,have invented certain new and useful Improvements in HypodermicSyringes, of which the following is a specification.

This invention relates to syringes and particnlarly to hypodermicsyringes and has for its object to provide a strong, simple andefficient instrument of the kind which will enable a physician tooperate more rapidly and withless trouble to himself and to the patientthan is possible with instruments for the purpose now in use.

With this as the principal object in view, the invention consists in thenovel construction, combination and arrangement of parts hereafterdescribed and pointed out in the appended claims and illustrated in theaccompanying drawing, in which:

Figure 1 is a side elevation of the syringe;

Fig. 2 is a vertical longitudinal sectional view of the same;

Fig. 3 is a cross sectional view on the line 33 of Fig. 2, and

Fig. 4 is a similar view on the line 4.--4, Figs. 3 and 4 being shown ona larger scale.

In the drawings, 10 indicates a barrel or cylinder of the syringe, inone end of which and extending substantially one-half the length of thebarrel is a chamber 11 for receiving the solution to be injected, theother half of the barrel has a bore 12 extending from the chamber 11 tothe opposite end and of slightly less diameter than the chamber. Throughthe bore 12 slides a plunger 13 of a length sufficient to extend throughthe bore and into the chamber nearly to its opposite end when whollydepressed. The plunger 13 is cylindrical as shown and of the samediameter from its inner end 14: to its outer end which is provided witha button 15 to be grasped by the fingers for operating the plunger andhas a shoulder 16 that forms a stop and abuts against the upper end ofthe barrel 10. The lower or outer end of the chamber 11 is closed by acap 17 that fits snugly over the end of the barrel and is locked inplace by pins 18 that project radially from the exterior of the barreland engage slots 19 in the side of the cap, said slots having inclinedwalls 20 that, bearin against the pins 18 when the cap is rotate to locksaid cap on the barrel.

ened on the needle,

Projecting axially from the cap is a threaded stem 21 on which a nut 22is screwed, said nut serving as a coupling member for securely holdingthe clamping jaws 23 on the stem 21 and the needle 24 firmly inposition. The needle 24 passes through an opening in the stem 21 and thecap 17 and may slide longitudinally therein whenever the nut 22 isunscrewed and the jaws 23 loosened, but as soon as the jaws are tightthe latter becomes fixed and rigid with the cap and with the barrel 10.

The needle 24 is hollow as usual and the two ends pointed so that eitherend may be used for insertion beneath the skin.

syringe constructed as described is quickly filled and easily cleanedowing to the fact that the cap and plunger may both be removed withouttrouble from the barrel. The plunger frame being cylindrical, being ofequal diameter from end to end and without packing affords no means forlodgment of dirt thereon or the retention of the substance in thebarrel. The chamber within the barrel is preferably straight from oneend to the small shoulder where the bore begins and said bore is of thesame diameter throughout its length. The needle is easily removed fromthe cap to enable the same to be cleaned and the cap being preferablysmooth on its inner side ofi'ers no corners for the lodgment of anyunsanitary particles.

Preferably the liquid to be injected is carried in a container or ampul25 made of glass in tubular form open at the ends and of a length to fitwithin the chamber 11. The ends of the container are closed and sealedby disks 26 of rubber, cork, or other material that is readilyperforated by the inner projecting end of the needle 24:. In using thecontainer, the cap 17 of the syringe is removed and the plungerwithdrawn into the bore 12 after which the container is inserted in thechamber 11 and the cap 17 replaced, by which means the inner end of theneedle punctures the closure 26 and projects into the container.Pressure on the plunger forces the upper closure through the containenand the liquid therein through the needle. By using containers such asdescribed, a great dead of time and trouble is saved as the contents ofthecontainers are properly proportioned for injection and they containthe proper amount for an injection.

What I claim is:

1. A syringe comprising a barrel having a straight cylindrical chamberextending thereinto from one end midway its length and a bore of lessdiameter extending from the chamber through to the opposite end, a capcontaining a needle removably secured to the chambered end of thebarrel, and a straight cylindrical plunger of uniform diameter fitted tothe bore and of a length to extend therethrough and into the chamberwhen depressed. v

2. A syringe comprising a straight cylindrical barrel having a chamberprojecting thereinto at one end and extending midway its length, and abore of less diameter extending from said chamber to the opposite end ofthe barrel, a cap movably fitted to the chambered end of the barrel andhaving projecting jaws, a needle extending through said cap and betweenthe jaws and adapted to be rigidly secured by means of said jaws to thecap, and a straight cylindrical plunger of uniform diameter slidablethrough said bore and into the chamber.

3. A syringe comprising a barrel having a chamber in one end thereofextending midway its length and a straight cylindrical bore through itsopposite end, the bore and .the chamber communicating, a removable oneend and extending midway the length thereof, and a bore ofless diameterthan the chamber extending from the chamber to the opposite ends of thebarrel, a straight cylindrical piston of uniform diameter slidable insaid bore and into the chamber, pins projecting laterally from the outersurface of the barrel near the chambered end, a cap having locking slotsadapted to fit on said barrel end and engage said pins by means of saidslots for locking said cap in position, clamping jaws on the outer endof said cap, a needle passing through a perforation in the cap andbetween said jaws, and clamping means for operating the jaws to grip theneedle.

5. A syringe comprising a barrel having a straight chamber in one endthereof extending midway its length and a straight cylindrical borethrough its opposite end, the bore and the chamber communicating, aremovable needle secured to the chambered end of the barrel, a plungerof uniform diameter mounted in the bore and adapted to be pressed intothe chamber, and a removable container for the fluid to be injected of asize capable of being inserted in the chanr bered end of the syringe andhaving perforatable closures at its ends movable longitudinally in thecontainer.

In testimony whereof I afliX my signature in presence of a witness.

HARVEY S. COOK.

Witness:

W. H. FLATER.

